Labetalol does not cause weight gain. There are many causes of weight gain such as increased food consumption without increasing physical activity, high junk food, Cushing’s syndrome, and hypothyroidism.
Advice
1.     Continue labetalol as suggested
2.     Continue workout in gym at least for half an hour for 4 – 5 days in a week regularly. Start with a balanced mix of cardio, weight training and flexibility exercises
3.     Avoid eating high energy foods such as cakes, chocolates, chips etc.
4.     Avoid alcohol and smoking
5.     Increase consumption of high fiber diet such as wheat bread, dry date, and vegetables
6.     Drink 3 – 4 liters of water daily
7.     Chew the food properly to make it easily digestible
8.     Avoid excess intake tea and coffee after meal
9.     Divide your meals into smaller portions and eat them frequently during the day
10.     Avoid oily & spicy food
11.     Investigation
a.     Fasting lipid profile
b.     blood sugar (F & PP)
I hope this information will help you. I will be happy if you ask another question
Thank